bnpl-blocks-independent-bnpl-anchornpm
Advisory published Updated
bnpl-blocks-independent-bnpl-anchor is a confirmed malicious npm package (MAL-2026-12949) that executes malicious code on install (malicious version 35.6.5). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bnpl-blocks-independent-bnpl-anchor (npm)
What this malware does
On require('bnpl-blocks-independent-bnpl-anchor'), index.js loads helpers.js which selects a per-platform payload, downloads an opaque binary from one of several Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT fallback to sdk.dl.wel1.ru, writes the payload to /tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are assembled from split string arrays (e.g. ['oob-worker.cf99','-9b3.workers.d','ev'].join('')) to evade static analysis. A hidden idempotency marker (/tmp/.analytics_state or %TEMP%\analytics_state) and env-var opt-outs (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) plus filenames like dotnet_diag_<uid>.exe give the loader a telemetry/diagnostics cover story. The fetched destinations are anonymous workers.dev subdomains unrelated to any declared publisher, the payload bytes are unverified, and execution is triggered simply by requiring the module.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bnpl-blocks-independent-bnpl-anchor (version 35.6.5).
If you installed it — respond
Remove bnpl-blocks-independent-bnpl-anchor from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If bnpl-blocks-independent-bnpl-anchor was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks bnpl-blocks-independent-bnpl-anchor-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.